.App {
    overflow: hidden;
    flex-direction: column;
    display: -webkit-flex;
    display: -moz-flex;
    display: -webkit-flex;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-flex-direction: column;
    -ms-flex-direction: column;
    flex-direction: column;
    position: relative;
    width: 100%;
    height: 100%;
}

.content {
    width: 100%;
    flex: 1;
    overflow-x: hidden;
    overflow-y: auto;
}